Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332...26c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 26-43. NSERC-supported research.
Astronomy and Astrophysics
Astrophysics
18
Cosmology, Galactic Clusters, Galactic Evolution, Interstellar Gas, Star Formation, Correlation, Dark Matter, Green'S Functions, Halos, Particle Collisions
Scientific paper
The formation of galaxies and their clustering is studied with an N-body model augmented to include a simple description of gas cooling and star formation. Two experiments are presented: an Ω = 1 model and an Ωi = 5/3 "cluster" model, both with perturbations drawn from a density perturbation spectrum with n = -1. The galaxies form with an enhanced clustering with respect to the underlying dark matter distribution, that is, the galaxies prefer to form in especially overdense regions of the initial density fluctuation field. Star formation is spread over the time interval during which galaxies can freely accrete gas-rich material, and the stellar mass of an average galaxy in the experiment increases by 36% from a redshift of 0.56. In contrast, star formation in the "cluster" experiment is abruptly terminated as the hot, nearly adiabatic, cluster gas sweeps remaining halo gas from the galaxies.
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